Blender displays the wrong X-relosution for JPEGs,
OK, found a solution.
Basically, blender is missing an EXIF reader. Luckily, python has the modules. We just need to install it.
Below is a basic method to install a module
https://b3d.interplanety.org/en/how-to-install-required-packages-to-the-blender-python-with-pip/
But did not work for me. Perhaps, its because of the office firewall or network....
So I installed the module using the wheel file, .whl, with the function below with blender (Not a powershell)
import subprocess
import sys
import os

# path to python.exe
python_exe = os.path.join(sys.prefix, 'bin', 'python.exe')

# install required packages
subprocess.call([python_exe, &quot;-m&quot;, &quot;pip&quot;, &quot;install&quot;, &quot;C:/LOCATION AND FILENAME.whl&quot;])

Don't need to install pip because since 2.8 its already installed.
I am using the ExifRead module. Arbitrary selection. The code below gets me the dpi I want.
import exifread

# Open image file for reading (binary mode)
f = open('C:/Users/csemeon/Desktop/Fabric/RED 1200dpi.jpg', 'rb')

# Return Exif tags
tags = exifread.process_file(f)

for tag in tags.keys():
    if tag in ('Image XResolution'):
        #print ('Key: %s, value %s' % (tag, tags[tag]))
        dpitest =  str(tags['Image XResolution'])
        dpi = float(dpitest)

Had to use a two steps to convert the value to float (or int). Because the Dpi is a tag and doesn't convert directly to float.
Hope it helps someone.